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Received January 17, 1994,Revised , Accepted , Available online

Volume 7,1995,Pages 399-406

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A Hoagland's 1 nutrient solution culture to observe the effect of 0 , 50 and 100 μmol/L oxalate acidon 0 to 10 mg/L Cd toxicity for tomato and 0 to 8 mg/L for bean and their accumulation in plants were studied. There was an almost linear relationship between Cd in roots and shoots of tomato and bean vs. Cd in thenutrient solution. Tornato roots accumulated about 15 times Cd than the plants' shoots and bean roots 4times. Root and shoot Cd accumulation vary greatly between plant species. Results also suggest organic acid inthe solution can complex Cd , detoxifying the solution. Complexed Cd can be absorbed by roots and transported to shoot and appears to be less toxic. Cd toxicity was reduced, though not completely in the tomato shootswhen oxalic acid was added to solutions containing 2. 5 mg/L and 5 mg/L Cd. Cadmium content in the shootsstill increased. At 2 and 4 mg/L Cd levels.with 25 μmol/L and 50 μmol/L oxalic acid addition in nutrient so-lution, bean shoot growth was not inhibited , but root growth was reduced. Cd content in both bean rcot andshcot also decreased.

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